Revert "[wasm] Enable --wasm-generic-wrapper"

This reverts commit f2034bf5.

Reason for revert: Issue on the generic wrapper

Original change's description:
> [wasm] Enable --wasm-generic-wrapper
>
> This CL enables the --wasm-generic-wrapper flag by default.
>
> Bug: v8:10982
> Change-Id: Iada906ce49810806c500ee3ca26e09e847b69a27
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2539915
> Commit-Queue: Vicky Kontoura <vkont@google.com>
> Reviewed-by: Andreas Haas <ahaas@chromium.org>
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#71374}

TBR=jkummerow@chromium.org,ahaas@chromium.org,vkont@google.com

Change-Id: I809de71155a76fce503ecd75c7c4854d507c3695
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:10982
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2557990Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71375}

src/flags/flag-definitions.h

@@ -776,9 +776,8 @@ DEFINE_BOOL(untrusted_code_mitigations, V8_DEFAULT_UNTRUSTED_CODE_MITIGATIONS,
 #undef V8_DEFAULT_UNTRUSTED_CODE_MITIGATIONS
 
 // Flags for native WebAssembly.
-DEFINE_BOOL(wasm_generic_wrapper, true,
-            "allow use of the generic js-to-wasm wrapper instead of "
-            "per-signature wrappers")
+DEFINE_BOOL(wasm_generic_wrapper, false,
+            "use generic js-to-wasm wrapper instead of per-signature wrappers")
 DEFINE_BOOL(expose_wasm, true, "expose wasm interface to JavaScript")
 DEFINE_INT(wasm_num_compilation_tasks, 128,
            "maximum number of parallel compilation tasks for wasm")