[fastcall] Store full size pointer to template data

This fixes an issue on 64-bit big endian architectures as discussed in
https://chromium-review.googlesource.com/c/v8/v8/+/2603925, where stack
slots always have the system pointer size, even with pointer compression
enabled.

Bug: chromium:1052746
Change-Id: I84030ba8bcde71cb1768bd7286314cf09c4dc640
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2645721Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72294}

src/compiler/effect-control-linearizer.cc

@@ -5014,7 +5014,7 @@ Node* EffectControlLinearizer::LowerFastApiCall(Node* node) {
         fast_api_call_stack_slot_,
         static_cast<int>(offsetof(v8::FastApiCallbackOptions, fallback)),
         jsgraph()->ZeroConstant());
-    __ Store(StoreRepresentation(MachineRepresentation::kTaggedPointer,
+    __ Store(StoreRepresentation(MachineType::PointerRepresentation(),
                                  kNoWriteBarrier),
              fast_api_call_stack_slot_,
              static_cast<int>(offsetof(v8::FastApiCallbackOptions, data)),