Fix static relocation model for PowerPC64

We now also use `should_assume_dso_local()` for declarations and port two
additional cases from clang:
- Exclude PPC64 [1]
- Exclude thread-local variables [2]

[1]: https://github.com/llvm/llvm-project/blob/033138ea452f5f493fb5095e5963419905ad12e1/clang/lib/CodeGen/CodeGenModule.cpp#L1038-L1040
[2]: https://github.com/llvm/llvm-project/blob/033138ea452f5f493fb5095e5963419905ad12e1/clang/lib/CodeGen/CodeGenModule.cpp#L1048-L1050

1 files changed, 2 insertions, 1 deletions

diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 966be4a53fd..8b1dcea3fa2 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -72,7 +72,7 @@ pub enum Linkage {
 
 // LLVMRustVisibility
 #[repr(C)]
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, PartialEq)]
 pub enum Visibility {
     Default = 0,
     Hidden = 1,
@@ -1035,6 +1035,7 @@ extern "C" {
     pub fn LLVMDeleteGlobal(GlobalVar: &Value);
     pub fn LLVMGetInitializer(GlobalVar: &Value) -> Option<&Value>;
     pub fn LLVMSetInitializer(GlobalVar: &'a Value, ConstantVal: &'a Value);
+    pub fn LLVMIsThreadLocal(GlobalVar: &Value) -> Bool;
     pub fn LLVMSetThreadLocal(GlobalVar: &Value, IsThreadLocal: Bool);
     pub fn LLVMSetThreadLocalMode(GlobalVar: &Value, Mode: ThreadLocalMode);
     pub fn LLVMIsGlobalConstant(GlobalVar: &Value) -> Bool;