[LLVM-C] Add accessors to the default floating-point metadata node

[CodaFi]

Summary

Add a getter and setter pair for floating-point accuracy metadata.

[whitequark]

LGTM

llvm/trunk/include/llvm-c/Core.h

 /**
  * Attempts to set the debug location for the given instruction using the
  * current debug location for the given builder.  If the builder has no current
  * debug location, this function is a no-op.
  *
  * @see llvm::IRBuilder::SetInstDebugLocation()
  */
 void LLVMSetInstDebugLocation(LLVMBuilderRef Builder, LLVMValueRef Inst);
-  
 /**
+ * Get the dafult floating-point math metadata for a given builder.
+ *
+ * @see llvm::IRBuilder::getDefaultFPMathTag()
+ */
+LLVMMetadataRef LLVMBuilderGetDefaultFPMathTag(LLVMBuilderRef Builder);
+
+/**
+ * Set the default floating-point math metadata for the given builder.
+ *
+ * To clear the metadata, pass NULL to \p FPMathTag.
+ *
+ * @see llvm::IRBuilder::setDefaultFPMathTag()
+ */
+void LLVMBuilderSetDefaultFPMathTag(LLVMBuilderRef Builder,
+                                    LLVMMetadataRef FPMathTag);
+
+/**
  * Deprecated: Passing the NULL location will crash.
  * Use LLVMGetCurrentDebugLocation2 instead.
  */
 void LLVMSetCurrentDebugLocation(LLVMBuilderRef Builder, LLVMValueRef L);
 /**
  * Deprecated: Returning the NULL location will crash.
  * Use LLVMGetCurrentDebugLocation2 instead.
  */

llvm/trunk/lib/IR/Core.cpp

LLVMValueRef LLVMGetCurrentDebugLocation(LLVMBuilderRef Builder) {
   return wrap(MetadataAsValue::get(
       Context, unwrap(Builder)->getCurrentDebugLocation().getAsMDNode()));
 }
 
 void LLVMSetInstDebugLocation(LLVMBuilderRef Builder, LLVMValueRef Inst) {
   unwrap(Builder)->SetInstDebugLocation(unwrap<Instruction>(Inst));
 }
 
+void LLVMBuilderSetDefaultFPMathTag(LLVMBuilderRef Builder,
+                                    LLVMMetadataRef FPMathTag) {
+
+  unwrap(Builder)->setDefaultFPMathTag(FPMathTag
+                                       ? unwrap<MDNode>(FPMathTag)
+                                       : nullptr);
+}
+
+LLVMMetadataRef LLVMBuilderGetDefaultFPMathTag(LLVMBuilderRef Builder) {
+  return wrap(unwrap(Builder)->getDefaultFPMathTag());
+}
+
 /*--.. Instruction builders ................................................--*/
 
 LLVMValueRef LLVMBuildRetVoid(LLVMBuilderRef B) {
   return wrap(unwrap(B)->CreateRetVoid());
 }
 
 LLVMValueRef LLVMBuildRet(LLVMBuilderRef B, LLVMValueRef V) {
   return wrap(unwrap(B)->CreateRet(unwrap(V)));