[IR] Redefine Freeze instruction

Summary:
This patch redefines freeze instruction from being UnaryOperator to a subclass of UnaryInstruction.

ConstantExpr freeze is removed, as discussed in the previous review.
FreezeOperator is not added because there's no ConstantExpr freeze.
`freeze i8* null` test is added to `test/Bindings/llvm-c/freeze.ll` as well, because the null pointer-related bug in `tools/llvm-c/echo.cpp` is now fixed.
InstVisitor has visitFreeze now because freeze is not unaryop anymore.

Reviewers: whitequark, deadalnix, craig.topper, jdoerfert, lebedev.ri

Reviewed By: craig.topper, lebedev.ri

Subscribers: regehr, nlopes, mehdi_amini, hiraditya, steven_wu, dexonsmith, jfb, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69932

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/include/llvm-c/Core.h b/llvm/include/llvm-c/Core.h
index 23e855148bb..83bf7077bcb 100644
--- a/llvm/include/llvm-c/Core.h
+++ b/llvm/include/llvm-c/Core.h
@@ -69,7 +69,6 @@ typedef enum {
 
   /* Standard Unary Operators */
   LLVMFNeg           = 66,
-  LLVMFreeze         = 68,
 
   /* Standard Binary Operators */
   LLVMAdd            = 8,
@@ -128,6 +127,7 @@ typedef enum {
   LLVMShuffleVector  = 52,
   LLVMExtractValue   = 53,
   LLVMInsertValue    = 54,
+  LLVMFreeze         = 68,
 
   /* Atomic operators */
   LLVMFence          = 55,
@@ -1601,6 +1601,7 @@ LLVMTypeRef LLVMX86MMXType(void);
         macro(ExtractValueInst)             \
         macro(LoadInst)                     \
         macro(VAArgInst)                    \
+        macro(FreezeInst)                   \
       macro(AtomicCmpXchgInst)              \
       macro(AtomicRMWInst)                  \
       macro(FenceInst)
@@ -3748,7 +3749,6 @@ LLVMValueRef LLVMBuildNUWNeg(LLVMBuilderRef B, LLVMValueRef V,
                              const char *Name);
 LLVMValueRef LLVMBuildFNeg(LLVMBuilderRef, LLVMValueRef V, const char *Name);
 LLVMValueRef LLVMBuildNot(LLVMBuilderRef, LLVMValueRef V, const char *Name);
-LLVMValueRef LLVMBuildFreeze(LLVMBuilderRef, LLVMValueRef V, const char *Name);
 
 /* Memory */
 LLVMValueRef LLVMBuildMalloc(LLVMBuilderRef, LLVMTypeRef Ty, const char *Name);
@@ -3909,6 +3909,8 @@ LLVMValueRef LLVMBuildExtractValue(LLVMBuilderRef, LLVMValueRef AggVal,
 LLVMValueRef LLVMBuildInsertValue(LLVMBuilderRef, LLVMValueRef AggVal,
                                   LLVMValueRef EltVal, unsigned Index,
                                   const char *Name);
+LLVMValueRef LLVMBuildFreeze(LLVMBuilderRef, LLVMValueRef Val,
+                             const char *Name);
 
 LLVMValueRef LLVMBuildIsNull(LLVMBuilderRef, LLVMValueRef Val,
                              const char *Name);