Subzero: Align the stack at the point of function calls.

tests_lit/llvm2ice_tests/undef.ll

 ; This test checks that undef values are represented as zero.
 
 ; RUN: %llvm2ice --verbose none %s | FileCheck  %s
 ; RUN: %llvm2ice -O2 --verbose none %s | FileCheck  %s
 ; RUN: %llvm2ice -mattr=sse4.1 --verbose none %s | FileCheck  %s
 ; RUN: %llvm2ice -mattr=sse4.1 -O2 --verbose none %s | FileCheck  %s
 ; RUN: %llvm2ice -O2 --verbose none %s \
 ; RUN:               | llvm-mc -arch=x86 -x86-asm-syntax=intel -filetype=obj
 ; RUN: %llvm2ice -Om1 --verbose none %s \
 ; RUN:               | llvm-mc -arch=x86 -x86-asm-syntax=intel -filetype=obj
@@ skipping 19 matching lines @@
 ; CHECK-LABEL: undef_i64:
 ; CHECK-DAG: mov eax, 0
 ; CHECK-DAG: mov edx, 0
 ; CHECK: ret
 }
 
 define float @undef_float() {
 entry:
   ret float undef
 ; CHECK-LABEL: undef_float:
-; CHECK-NOT: sub esp
-; CHECK: fld
+; CHECK: [L$float$
 }
 
 define <4 x i1> @undef_v4i1() {
 entry:
   ret <4 x i1> undef
 ; CHECK-LABEL: undef_v4i1:
 ; CHECK: pxor
 }
 
 define <8 x i1> @undef_v8i1() {
@@ skipping 234 matching lines @@
 define <4 x float> @vector_select_v4f32_arg2(<4 x i1> %cond, <4 x float> %a) {
 entry:
   %val = select <4 x i1> %cond, <4 x float> %a, <4 x float> undef
   ret <4 x float> %val
 ; CHECK-LABEL: vector_select_v4f32_arg2:
 ; CHECK: pxor
 }
 
 ; ERRORS-NOT: ICE translation error
 ; DUMP-NOT: SZ