Add the NonLazyBind attribute to rustllvm

This attribute informs LLVM to skip PLT calls in codegen.

Author: GabrielMajeri

src/librustc_codegen_llvm/llvm/ffi.rs

@@ -122,6 +122,7 @@ pub enum Attribute {
     SanitizeThread  = 20,
     SanitizeAddress = 21,
     SanitizeMemory  = 22,
+    NonLazyBind     = 23,
 }
 
 /// LLVMIntPredicate

src/rustllvm/RustWrapper.cpp

@@ -178,6 +178,8 @@ static Attribute::AttrKind fromRust(LLVMRustAttribute Kind) {
     return Attribute::SanitizeAddress;
   case SanitizeMemory:
     return Attribute::SanitizeMemory;
+  case NonLazyBind:
+    return Attribute::NonLazyBind;
   }
   report_fatal_error("bad AttributeKind");
 }

src/rustllvm/rustllvm.h

@@ -97,6 +97,7 @@ enum LLVMRustAttribute {
   SanitizeThread = 20,
   SanitizeAddress = 21,
   SanitizeMemory = 22,
+  NonLazyBind = 23,
 };
 
 typedef struct OpaqueRustString *RustStringRef;