Add vcvt<c>.f32.f64 and vcvt<c>.f64.32 to ARM.

tests_lit/assembler/arm32/vcvt_f32_f64.ll

+; Show that we know how to translate vcvt between float and double.
+
+; NOTE: We use -O2 to get rid of memory stores.
+
+; REQUIRES: allow_dump
+
+; Compile using standalone assembler.
+; RUN: %p2i --filetype=asm -i %s --target=arm32 --args -O2 \
+; RUN:   | FileCheck %s --check-prefix=ASM
+
+; Show bytes in assembled standalone code.
+; RUN: %p2i --filetype=asm -i %s --target=arm32 --assemble --disassemble \
+; RUN:   --args -O2 | FileCheck %s --check-prefix=DIS
+
+; Compile using integrated assembler.
+; RUN: %p2i --filetype=iasm -i %s --target=arm32 --args -O2 \
+; RUN:   | FileCheck %s --check-prefix=IASM
+
+; Show bytes in assembled integrated code.
+; RUN: %p2i --filetype=iasm -i %s --target=arm32 --assemble --disassemble \
+; RUN:   --args -O2 | FileCheck %s --check-prefix=DIS
+
+define internal double @testVcvtFloatToDouble(float %v) {
+; ASM-LABEL: testVcvtFloatToDouble:
+; DIS-LABEL: 00000000 <testVcvtFloatToDouble>:
+; IASM-LABEL: testVcvtFloatToDouble:
+
+entry:
+; ASM-NEXT: .LtestVcvtFloatToDouble$entry:
+; IASM-NEXT: .LtestVcvtFloatToDouble$entry:
+
+  %res = fpext float %v to double
+
+; ASM-NEXT:    vcvt.f64.f32    d0, s0
+; DIS-NEXT:    0:       eeb70ac0
+; IASM-NEXT:    .byte 0xc0
+; IASM-NEXT:    .byte 0xa
+; IASM-NEXT:    .byte 0xb7
+; IASM-NEXT:    .byte 0xee
+
+  ret double %res
+}
+
+define internal float @testVcvtDoubleToFloat(double %v) {
+; ASM-LABEL: testVcvtDoubleToFloat:
+; DIS-LABEL: 00000010 <testVcvtDoubleToFloat>:
+; IASM-LABEL: testVcvtDoubleToFloat:
+
+entry:
+; ASM-NEXT: .LtestVcvtDoubleToFloat$entry:
+; IASM-NEXT: .LtestVcvtDoubleToFloat$entry:
+
+  %res = fptrunc double %v to float
+; ASM-NEXT:    vcvt.f32.f64    s0, d0
+; DIS-NEXT:   10:       eeb70bc0
+; IASM-NEXT:    .byte 0xc0
+; IASM-NEXT:    .byte 0xb
+; IASM-NEXT:    .byte 0xb7
+; IASM-NEXT:    .byte 0xee
+
+  ret float %res
+}