PPC/s390: [liftoff] Rename {emit_u32_to_intptr} to {emit_u32_to_uintptr}

Port 276355cb

Original Commit Message:

    The 32-bit value is zero-extended to pointer size, which is a no-op on
    32-bit systems. The operation changes nothing about the signedness of
    the value, so the old name was a bit misleading.

    We also provide one unified no-op implementation for all 32-bit systems.

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

Change-Id: Ica443175725f12e44e69ad22e5fe347c56ea6c13
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3429208Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#78889}

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

@@ -1116,7 +1116,7 @@ void LiftoffAssembler::FillStackSlotsWithZero(int start, int size) {
     LFR_TO_REG, LFR_TO_REG, USE, , void)                                     \
   V(i64_ctz, CountTrailingZerosU64, LiftoffRegister, LiftoffRegister,        \
     LFR_TO_REG, LFR_TO_REG, USE, , void)                                     \
-  V(u32_to_intptr, ZeroExtWord32, Register, Register, , , USE, , void)       \
+  V(u32_to_uintptr, ZeroExtWord32, Register, Register, , , USE, , void)      \
   V(i32_signextend_i8, extsb, Register, Register, , , USE, , void)           \
   V(i32_signextend_i16, extsh, Register, Register, , , USE, , void)          \
   V(i64_signextend_i8, extsb, LiftoffRegister, LiftoffRegister, LFR_TO_REG,  \

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

@@ -1561,7 +1561,7 @@ void LiftoffAssembler::FillStackSlotsWithZero(int start, int size) {
   V(i32_popcnt, Popcnt32, Register, Register, , , USE, true, bool)             \
   V(i64_popcnt, Popcnt64, LiftoffRegister, LiftoffRegister, LFR_TO_REG,        \
     LFR_TO_REG, USE, true, bool)                                               \
-  V(u32_to_intptr, LoadU32, Register, Register, , , USE, , void)               \
+  V(u32_to_uintptr, LoadU32, Register, Register, , , USE, , void)              \
   V(i32_signextend_i8, lbr, Register, Register, , , USE, , void)               \
   V(i32_signextend_i16, lhr, Register, Register, , , USE, , void)              \
   V(i64_signextend_i8, lgbr, LiftoffRegister, LiftoffRegister, LFR_TO_REG,     \