[OPENMP]Rename function, NFC.

Change the name of the CGOpenMPRuntime::emitOMPIfClause to CGOpenMPRuntime::emitIfClause.
diff --git a/clang/lib/CodeGen/CGOpenMPRuntimeNVPTX.cpp b/clang/lib/CodeGen/CGOpenMPRuntimeNVPTX.cpp
index 96716c0..abfba39 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntimeNVPTX.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntimeNVPTX.cpp
@@ -2647,7 +2647,7 @@
   };
 
   if (IfCond) {
-    emitOMPIfClause(CGF, IfCond, LNParallelGen, SeqGen);
+    emitIfClause(CGF, IfCond, LNParallelGen, SeqGen);
   } else {
     CodeGenFunction::RunCleanupsScope Scope(CGF);
     RegionCodeGenTy ThenRCG(LNParallelGen);