Revert "CodeGen: ensure that libcalls are always AAPCS CC"

This reverts SVN r280683.  Revert until I figure out why this is breaking lli
tests.

llvm-svn: 280778
diff --git a/llvm/test/CodeGen/ARM/tail-call-builtin.ll b/llvm/test/CodeGen/ARM/tail-call-builtin.ll
index 0ed15bc..c829cc5 100644
--- a/llvm/test/CodeGen/ARM/tail-call-builtin.ll
+++ b/llvm/test/CodeGen/ARM/tail-call-builtin.ll
@@ -1,38 +1,37 @@
 ; RUN: llc -mtriple=thumbv7-linux-gnueabihf %s -o - | FileCheck %s
 
-define arm_aapcs_vfpcc i64 @test_mismatched_call(double %in) {
+define i64 @test_mismatched_call(double %in) {
 ; CHECK-LABEL: test_mismatched_call:
-; CHECK: vmov r0, r1, d0
 ; CHECK: bl floor
+; CHECK: vmov r0, r1, d0
 
-  %val = tail call arm_aapcscc double @floor(double %in)
+  %val = tail call double @floor(double %in)
   %res = bitcast double %val to i64
   ret i64 %res
 }
 
-define arm_aapcs_vfpcc double @test_matched_call(double %in) {
+define double @test_matched_call(double %in) {
 ; CHECK-LABEL: test_matched_call:
-; CHECK: b _floor
+; CHECK: b floor
 
-  %val = tail call arm_aapcs_vfpcc double @_floor(double %in)
+  %val = tail call double @floor(double %in)
   ret double %val
 }
 
-define arm_aapcs_vfpcc void @test_irrelevant_call(double %in) {
+define void @test_irrelevant_call(double %in) {
 ; CHECK-LABEL: test_irrelevant_call:
 ; CHECK-NOT: bl floor
 
-  %val = tail call arm_aapcscc double @floor(double %in)
+  %val = tail call double @floor(double %in)
   ret void
 }
 
-define arm_aapcs_vfpcc double @test_callingconv(double %in) {
+define arm_aapcscc double @test_callingconv(double %in) {
 ; CHECK: test_callingconv:
 ; CHECK: bl floor
 
-  %val = tail call arm_aapcscc double @floor(double %in)
+  %val = tail call double @floor(double %in)
   ret double %val
 }
 
-declare arm_aapcs_vfpcc double @_floor(double) nounwind readonly
-declare arm_aapcscc double @floor(double) nounwind readonly
+declare double @floor(double) nounwind readonly