Rollup merge of #78848 - DevJPM:ci-llvm-9, r=nikic

Bump minimal supported LLVM version to 9

This bumps the minimal tested llvm version to 9.
This should enable supporting newer LLVM features (and CPU extensions).

This was motived by #78361 having to drop features because of LLVM 8 not supporting certain CPU extensions yet.
This was declared relatively uncontroversial on [Zulip](https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/Min.20Supported.20LLVM.20Upgrade.20Process.3F/near/215957859).

Paging ````@eddyb```` because there was a comment in the [dockerfile](https://github.com/rust-lang/rust/blob/master/src/ci/docker/host-x86_64/x86_64-gnu-llvm-8/Dockerfile#L42) describing a hack (which I don't quite understand) which was also blocked by not having LLVM 9.

6 files changed, 7 insertions, 9 deletions

diff --git a/src/bootstrap/native.rs b/src/bootstrap/native.rs
index 6dc83c7d70a..d716b23af60 100644
--- a/src/bootstrap/native.rs
+++ b/src/bootstrap/native.rs
@@ -348,11 +348,11 @@ fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
     let version = output(cmd.arg("--version"));
     let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
     if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
-        if major >= 8 {
+        if major >= 9 {
             return;
         }
     }
-    panic!("\n\nbad LLVM version: {}, need >=8.0\n\n", version)
+    panic!("\n\nbad LLVM version: {}, need >=9.0\n\n", version)
 }
 
 fn configure_cmake(
diff --git a/src/ci/docker/host-x86_64/x86_64-gnu-llvm-8/Dockerfile b/src/ci/docker/host-x86_64/x86_64-gnu-llvm-9/Dockerfile
index bd046f802c8..0ab1f727a29 100644
--- a/src/ci/docker/host-x86_64/x86_64-gnu-llvm-8/Dockerfile
+++ b/src/ci/docker/host-x86_64/x86_64-gnu-llvm-9/Dockerfile
@@ -13,7 +13,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   cmake \
   sudo \
   gdb \
-  llvm-8-tools \
+  llvm-9-tools \
+  llvm-9-dev \
   libedit-dev \
   libssl-dev \
   pkg-config \
@@ -27,7 +28,7 @@ RUN sh /scripts/sccache.sh
 # using llvm-link-shared due to libffi issues -- see #34486
 ENV RUST_CONFIGURE_ARGS \
       --build=x86_64-unknown-linux-gnu \
-      --llvm-root=/usr/lib/llvm-8 \
+      --llvm-root=/usr/lib/llvm-9 \
       --enable-llvm-link-shared \
       --set rust.thin-lto-import-instr-limit=10
 
diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index 031000d147c..9eea6243dfa 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -280,7 +280,7 @@ jobs:
           - name: mingw-check
             <<: *job-linux-xl
 
-          - name: x86_64-gnu-llvm-8
+          - name: x86_64-gnu-llvm-9
             <<: *job-linux-xl
 
           - name: x86_64-gnu-tools
@@ -412,7 +412,7 @@ jobs:
           - name: x86_64-gnu-distcheck
             <<: *job-linux-xl
 
-          - name: x86_64-gnu-llvm-8
+          - name: x86_64-gnu-llvm-9
             env:
               RUST_BACKTRACE: 1
             <<: *job-linux-xl
diff --git a/src/test/codegen/abi-efiapi.rs b/src/test/codegen/abi-efiapi.rs
index 1c0b77ad9c7..6cb2728359b 100644
--- a/src/test/codegen/abi-efiapi.rs
+++ b/src/test/codegen/abi-efiapi.rs
@@ -1,7 +1,6 @@
 // Checks if the correct annotation for the efiapi ABI is passed to llvm.
 
 // revisions:x86_64 i686 aarch64 arm riscv
-// min-llvm-version: 9.0
 // needs-llvm-components: aarch64 arm riscv
 
 //[x86_64] compile-flags: --target x86_64-unknown-uefi
diff --git a/src/test/codegen/force-unwind-tables.rs b/src/test/codegen/force-unwind-tables.rs
index eba4a7469f9..4c0a5602c6d 100644
--- a/src/test/codegen/force-unwind-tables.rs
+++ b/src/test/codegen/force-unwind-tables.rs
@@ -1,4 +1,3 @@
-// min-llvm-version: 8.0
 // compile-flags: -C no-prepopulate-passes -C force-unwind-tables=y
 
 #![crate_type="lib"]
diff --git a/src/test/ui/sanitize/new-llvm-pass-manager-thin-lto.rs b/src/test/ui/sanitize/new-llvm-pass-manager-thin-lto.rs
index 9439df266d5..1542c7f3118 100644
--- a/src/test/ui/sanitize/new-llvm-pass-manager-thin-lto.rs
+++ b/src/test/ui/sanitize/new-llvm-pass-manager-thin-lto.rs
@@ -2,7 +2,6 @@
 // being run when compiling with new LLVM pass manager and ThinLTO.
 // Note: The issue occurred only on non-zero opt-level.
 //
-// min-llvm-version: 9.0
 // needs-sanitizer-support
 // needs-sanitizer-address
 //