TableGen: Sort RuntimeLibcallImpls secondarily by enum names

Extracted from #150192, this hopefully fixes occasional EXPENSIVE_CHECKS
failures.

Author: arsenm

llvm/test/TableGen/RuntimeLibcallEmitter.td

@@ -95,8 +95,8 @@ def BlahLibrary : SystemRuntimeLibrary<isBlahArch, (add calloc, LibraryWithCondi
 // CHECK-NEXT:  __lshrdi3 = 4, // __lshrdi3
 // CHECK-NEXT:  bzero = 5, // bzero
 // CHECK-NEXT:  calloc = 6, // calloc
-// CHECK-NEXT:  sqrtl_f80 = 7, // sqrtl
-// CHECK-NEXT:  sqrtl_f128 = 8, // sqrtl
+// CHECK-NEXT:  sqrtl_f128 = 7, // sqrtl
+// CHECK-NEXT:  sqrtl_f80 = 8, // sqrtl
 // CHECK-NEXT:  NumLibcallImpls = 9
 // CHECK-NEXT: };
 // CHECK-NEXT: } // End namespace RTLIB
@@ -157,8 +157,8 @@ def BlahLibrary : SystemRuntimeLibrary<isBlahArch, (add calloc, LibraryWithCondi
 // CHECK-NEXT: RTLIB::SRL_I64, // RTLIB::__lshrdi3
 // CHECK-NEXT: RTLIB::BZERO, // RTLIB::bzero
 // CHECK-NEXT: RTLIB::CALLOC, // RTLIB::calloc
-// CHECK-NEXT: RTLIB::SQRT_F80, // RTLIB::sqrtl_f80
 // CHECK-NEXT: RTLIB::SQRT_F128, // RTLIB::sqrtl_f128
+// CHECK-NEXT: RTLIB::SQRT_F80, // RTLIB::sqrtl_f80
 // CHECK-NEXT: };
 
 

llvm/utils/TableGen/Basic/RuntimeLibcallsEmitter.cpp

@@ -242,11 +242,10 @@ class RuntimeLibcallEmitter {
     SmallVector<const Record *, 1024> AllRuntimeLibcallImpls(
         AllRuntimeLibcallImplsRaw);
 
-    // Sort by libcall impl name, not the enum name. This keeps the order
-    // suitable for using the name table for libcall recognition binary search.
-    llvm::sort(AllRuntimeLibcallImpls, [](const Record *A, const Record *B) {
-      return A->getValueAsString("LibCallFuncName") <
-             B->getValueAsString("LibCallFuncName");
+    // Sort by libcall impl name and secondarily by the enum name.
+    sort(AllRuntimeLibcallImpls, [](const Record *A, const Record *B) {
+      return std::pair(A->getValueAsString("LibCallFuncName"), A->getName()) <
+             std::pair(B->getValueAsString("LibCallFuncName"), B->getName());
     });
 
     RuntimeLibcallImplDefList.reserve(AllRuntimeLibcallImpls.size());