Backport V8_TRAP_HANDLER_SUPPORTED conditional compilation for trap
handler implementation.

See https://github.com/v8/v8/commit/e7bef8d4cc4f38cc3d5a532fbcc445dc62adc08f

E.g. when cross-compiling from aarch64-linux for x86_64-linux target,
handler-inside-posix.cc is built on aarch64-linux even though it is not
supported; see src/trap-handler/trap-handler.h in v8 for (host, target)
combinations where trap handler is supported.

Note that handler-inside-posix.cc fails to build in the case above.

diff --git a/deps/v8/src/trap-handler/handler-inside-posix.cc b/deps/v8/src/trap-handler/handler-inside-posix.cc
index e4454c378f..17af3d75dc 100644
--- a/deps/v8/src/trap-handler/handler-inside-posix.cc
+++ b/deps/v8/src/trap-handler/handler-inside-posix.cc
@@ -47,6 +47,8 @@ namespace v8 {
 namespace internal {
 namespace trap_handler {
 
+#if V8_TRAP_HANDLER_SUPPORTED
+
 #if V8_OS_LINUX
 #define CONTEXT_REG(reg, REG) &uc->uc_mcontext.gregs[REG_##REG]
 #elif V8_OS_DARWIN
@@ -181,6 +183,8 @@ void HandleSignal(int signum, siginfo_t* info, void* context) {
   // TryHandleSignal modifies context to change where we return to.
 }
 
+#endif
+
 }  // namespace trap_handler
 }  // namespace internal
 }  // namespace v8
diff --git a/deps/v8/src/trap-handler/handler-inside-win.cc b/deps/v8/src/trap-handler/handler-inside-win.cc
index fcccc78ee5..3d7a2c416a 100644
--- a/deps/v8/src/trap-handler/handler-inside-win.cc
+++ b/deps/v8/src/trap-handler/handler-inside-win.cc
@@ -38,6 +38,8 @@ namespace v8 {
 namespace internal {
 namespace trap_handler {
 
+#if V8_TRAP_HANDLER_SUPPORTED
+
 // The below struct needed to access the offset in the Thread Environment Block
 // to see if the thread local storage for the thread has been allocated yet.
 //
@@ -129,6 +131,8 @@ LONG HandleWasmTrap(EXCEPTION_POINTERS* exception) {
   return EXCEPTION_CONTINUE_SEARCH;
 }
 
+#endif
+
 }  // namespace trap_handler
 }  // namespace internal
 }  // namespace v8
diff --git a/deps/v8/src/trap-handler/handler-outside-simulator.cc b/deps/v8/src/trap-handler/handler-outside-simulator.cc
index 179eab0659..5e58719e7f 100644
--- a/deps/v8/src/trap-handler/handler-outside-simulator.cc
+++ b/deps/v8/src/trap-handler/handler-outside-simulator.cc
@@ -4,6 +4,9 @@
 
 #include "include/v8config.h"
 #include "src/trap-handler/trap-handler-simulator.h"
+#include "src/trap-handler/trap-handler.h"
+
+#if V8_TRAP_HANDLER_SUPPORTED
 
 #if V8_OS_DARWIN
 #define SYMBOL(name) "_" #name
@@ -35,3 +38,5 @@ asm(
     SYMBOL(v8_probe_memory_continuation) ":         \n"
     // If the trap handler continues here, it wrote the landing pad in %rax.
     "  ret                                          \n");
+
+#endif