Subzero: Use cvttss2si and similar instead of cvtss2si for fp->int casts.

tests_lit/llvm2ice_tests/vector-cast.ll

 ; This file tests casting / conversion operations that apply to vector types.
 ; bitcast operations are in vector-bitcast.ll.
 
 ; TODO(jvoung): fix extra "CALLTARGETS" run. The llvm-objdump symbolizer
 ; doesn't know how to symbolize non-section-local functions.
 ; The newer LLVM 3.6 one does work, but watch out for other bugs.
 
 ; RUN: %llvm2ice -O2 --verbose none %s \
 ; RUN:   | FileCheck --check-prefix=CALLTARGETS %s
 ; RUN: %llvm2ice -O2 --verbose none %s \
@@ skipping 120 matching lines @@
 }
 
 ; fpto[us]i operations
 
 define <4 x i32> @test_fptosi_v4f32_to_v4i32(<4 x float> %arg) {
 entry:
   %res = fptosi <4 x float> %arg to <4 x i32>
   ret <4 x i32> %res
 
 ; CHECK-LABEL: test_fptosi_v4f32_to_v4i32:
-; CHECK: cvtps2dq
+; CHECK: cvttps2dq
 }
 
 define <4 x i32> @test_fptoui_v4f32_to_v4i32(<4 x float> %arg) {
 entry:
   %res = fptoui <4 x float> %arg to <4 x i32>
   ret <4 x i32> %res
 
 ; CHECK-LABEL: test_fptoui_v4f32_to_v4i32:
 ; CHECK: call -4
 ; CALLTARGETS-LABEL: test_fptoui_v4f32_to_v4i32
@@ skipping 17 matching lines @@
   ret <4 x float> %res
 
 ; CHECK-LABEL: test_uitofp_v4i32_to_v4f32:
 ; CHECK: call -4
 ; CALLTARGETS-LABEL: test_uitofp_v4i32_to_v4f32
 ; CALLTARGETS: call Sz_uitofp_v4i32
 }
 
 ; ERRORS-NOT: ICE translation error
 ; DUMP-NOT: SZ