PPC/s390: [wasm-simd][liftoff][x64] Implement saturating rounding multiply high

Port 6f521386

Original Commit Message:

    Create a macro-assembler helper function to enable code sharing between
    Liftoff and TurboFan.

R=zhin@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: I3e72ad3a2d7dfdd9737a5acd2416741c1d486306
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2625880Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72069}

src/wasm/baseline/ppc/liftoff-assembler-ppc.h

@@ -1185,6 +1185,12 @@ void LiftoffAssembler::emit_i16x8_extmul_high_i8x16_s(LiftoffRegister dst,
   bailout(kSimd, "i16x8.extmul_high_i8x16_s unsupported");
 }
 
+void LiftoffAssembler::emit_i16x8_q15mulr_sat_s(LiftoffRegister dst,
+                                                LiftoffRegister src1,
+                                                LiftoffRegister src2) {
+  bailout(kSimd, "i16x8_q15mulr_sat_s");
+}
+
 void LiftoffAssembler::emit_i16x8_extmul_high_i8x16_u(LiftoffRegister dst,
                                                       LiftoffRegister src1,
                                                       LiftoffRegister src2) {

src/wasm/baseline/s390/liftoff-assembler-s390.h

@@ -1338,6 +1338,12 @@ void LiftoffAssembler::emit_i16x8_extmul_high_i8x16_s(LiftoffRegister dst,
   bailout(kSimd, "i16x8.extmul_high_i8x16_s unsupported");
 }
 
+void LiftoffAssembler::emit_i16x8_q15mulr_sat_s(LiftoffRegister dst,
+                                                LiftoffRegister src1,
+                                                LiftoffRegister src2) {
+  bailout(kSimd, "i16x8_q15mulr_sat_s");
+}
+
 void LiftoffAssembler::emit_i16x8_extmul_high_i8x16_u(LiftoffRegister dst,
                                                       LiftoffRegister src1,
                                                       LiftoffRegister src2) {