Clean up handling of ARM IR instruction "mov".

tests_lit/assembler/arm32/vmov-cast.ll

-; Show that we know how to translate vadd.
+; Show that we know how to translate vmov for casts.
 
-; NOTE: Restricts S and D registers to ones that will better test S/D
-; register encodings.
+; NOTE: Restricts S register to one that will better test S register encodings.
 
 ; REQUIRES: allow_dump
 
 ; Compile using standalone assembler.
 ; RUN: %p2i --filetype=asm -i %s --target=arm32 --args -Om1 \
 ; RUN:   -reg-use s20,s22,d20,d22 \
 ; RUN:   | FileCheck %s --check-prefix=ASM
 
 ; Show bytes in assembled standalone code.
 ; RUN: %p2i --filetype=asm -i %s --target=arm32 --assemble --disassemble \
 ; RUN:   --args -Om1 \
 ; RUN:   -reg-use s20,s22,d20,d22 \
 ; RUN:   | FileCheck %s --check-prefix=DIS
 
 ; Compile using integrated assembler.
 ; RUN: %p2i --filetype=iasm -i %s --target=arm32 --args -Om1 \
 ; RUN:   -reg-use s20,s22,d20,d22 \
 ; RUN:   | FileCheck %s --check-prefix=IASM
 
 ; Show bytes in assembled integrated code.
 ; RUN: %p2i --filetype=iasm -i %s --target=arm32 --assemble --disassemble \
 ; RUN:   --args -Om1 \
 ; RUN:   -reg-use s20,s22,d20,d22 \
 ; RUN:   | FileCheck %s --check-prefix=DIS
 
-define internal float @testVaddFloat(float %v1, float %v2) {
-; ASM-LABEL: testVaddFloat:
-; DIS-LABEL: 00000000 <testVaddFloat>:
-; IASM-LABEL: testVaddFloat:
+define internal float @castToFloat(i32 %a) {
+; ASM-LABEL: castToFloat:
+; DIS-LABEL: 00000000 <castToFloat>:
+; IASM-LABEL: castToFloat:
 
 entry:
-  %res = fadd float %v1, %v2
+; ASM: .LcastToFloat$entry:
+; IASM: .LcastToFloat$entry:
 
-; ASM:     vadd.f32        s20, s20, s22
-; DIS:   1c:       ee3aaa0b
-; IASM-NOT:     vadd
+  %0 = bitcast i32 %a to float
 
-  ret float %res
+; ASM:          vmov    s20, r0
+; DIS:  10:     ee0a0a10
+; IASM-NOT:     vmov
+
+  ret float %0
 }
-
-define internal double @testVaddDouble(double %v1, double %v2) {
-; ASM-LABEL: testVaddDouble:
-; DIS-LABEL: 00000040 <testVaddDouble>:
-; IASM-LABEL: .LtestVaddDouble$entry:
-
-entry:
-  %res = fadd double %v1, %v2
-
-; ASM:        vadd.f64        d20, d20, d22
-; DIS:      54:       ee744ba6
-; IASM-NOT:   vadd
-
-  ret double %res
-}