Index: lib/Transforms/Utils/FunctionComparator.cpp
===================================================================
--- lib/Transforms/Utils/FunctionComparator.cpp
+++ lib/Transforms/Utils/FunctionComparator.cpp
@@ -710,7 +710,7 @@
     return Res;
   if (int Res = cmpNumbers(L->getDialect(), R->getDialect()))
     return Res;
-  llvm_unreachable("InlineAsm blocks were not uniqued.");
+  assert(L->getFunctionType() != R->getFunctionType());
   return 0;
 }
 
Index: test/Transforms/MergeFunc/inline-asm.ll
===================================================================
--- /dev/null
+++ test/Transforms/MergeFunc/inline-asm.ll
@@ -0,0 +1,18 @@
+; RUN: opt -mergefunc -S < %s | FileCheck %s
+declare void @stuff()
+
+define void @float_ptr() {
+  call void asm "nop", "r"(float* null)
+  call void @stuff()
+  call void @stuff()
+  ret void
+}
+
+define void @int_ptr() {
+; CHECK-LABEL: @int_ptr
+; CHECK-NEXT: tail call void @float_ptr
+  call void asm "nop", "r"(i32* null)
+  call void @stuff()
+  call void @stuff()
+  ret void
+}