[wasm] Fixed register allocation for Word32PairShl on arm.

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 907548d4588bdc2123a943a8da9755ef44a8eed7..2189b37eacc3ee55a23d50359846446c668fa2ec 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -1101,11 +1101,12 @@ void MacroAssembler::VmovLow(DwVfpRegister dst, Register src) {
     vmov(dst, VmovIndexLo, src);
   }
 }
-void MacroAssembler::PairLsl(Register dst_low, Register dst_high,
+void MacroAssembler::LslPair(Register dst_low, Register dst_high,
                              Register src_low, Register src_high,
                              Register scratch, Register shift) {
-  DCHECK(!AreAliased(dst_low, src_high, shift));
-  DCHECK(!AreAliased(dst_high, src_low, shift));
+  DCHECK(!AreAliased(dst_high, src_low));
+  DCHECK(!AreAliased(dst_high, shift));
+
   Label less_than_32;
   Label done;
   cmp_raw_immediate(shift, 32);
@@ -1124,10 +1125,9 @@ void MacroAssembler::PairLsl(Register dst_low, Register dst_high,
   bind(&done);
 }
 
-void MacroAssembler::PairLsl(Register dst_low, Register dst_high,
+void MacroAssembler::LslPair(Register dst_low, Register dst_high,
                              Register src_low, Register src_high,
                              uint32_t shift) {
-  DCHECK(!AreAliased(dst_low, src_high));
   DCHECK(!AreAliased(dst_high, src_low));
   Label less_than_32;
   Label done;
@@ -1136,8 +1136,8 @@ void MacroAssembler::PairLsl(Register dst_low, Register dst_high,
     lsl(dst_high, src_low, Operand(shift));
     mov(dst_low, Operand(0));
   } else if (shift == 0) {
-    Move(dst_low, src_low);
     Move(dst_high, src_high);
+    Move(dst_low, src_low);
   } else {
     lsl(dst_high, src_high, Operand(shift));
     orr(dst_high, dst_high, Operand(src_low, LSR, 32 - shift));