[PATCH] C API: implement LLVM{Get,Set}InstructionAlignment

[Peter Zotov]

Existing LLVM{Get,Set}Alignment functions do not work on instructions,
as they use unwrap<GlobalValue>.

http://llvm-reviews.chandlerc.com/D1910

Files:
  include/llvm-c/Core.h
  lib/IR/Core.cpp

Index: include/llvm-c/Core.h
===================================================================
--- include/llvm-c/Core.h
+++ include/llvm-c/Core.h
@@ -2495,6 +2495,8 @@
                                       const char *Name);
 LLVMBool LLVMGetVolatile(LLVMValueRef MemoryAccessInst);
 void LLVMSetVolatile(LLVMValueRef MemoryAccessInst, LLVMBool IsVolatile);
+unsigned LLVMGetInstructionAlignment(LLVMValueRef MemoryAccessInst);
+void LLVMSetInstructionAlignment(LLVMValueRef MemoryAccessInst, unsigned Alignment);
 
 /* Casts */
 LLVMValueRef LLVMBuildTrunc(LLVMBuilderRef, LLVMValueRef Val,
Index: lib/IR/Core.cpp
===================================================================
--- lib/IR/Core.cpp
+++ lib/IR/Core.cpp
@@ -2207,6 +2207,20 @@
   return cast<StoreInst>(P)->setVolatile(isVolatile);
 }
 
+unsigned LLVMGetInstructionAlignment(LLVMValueRef MemAccessInst) {
+	Value *P = unwrap<Value>(MemAccessInst);
+	if (LoadInst *LI = dyn_cast<LoadInst>(P))
+		return LI->getAlignment();
+	return cast<StoreInst>(P)->getAlignment();
+}
+
+void LLVMSetInstructionAlignment(LLVMValueRef MemAccessInst, unsigned Alignment) {
+	Value *P = unwrap<Value>(MemAccessInst);
+	if (LoadInst *LI = dyn_cast<LoadInst>(P))
+		return LI->setAlignment(Alignment);
+	return cast<StoreInst>(P)->setAlignment(Alignment);
+}
+
 /*--.. Casts ...............................................................--*/
 
 LLVMValueRef LLVMBuildTrunc(LLVMBuilderRef B, LLVMValueRef Val,
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