revert [jit] Increase x86_64 default code size to full 2GiB hugepage (#318) (#337)

revert [jit] Increase x86_64 default code size to full 2GiB hugepage (#318)

Abuses the existence of transparent huge pages on Unix. 4*2 = 8GiB virtual memory used total by JIT. May reduce native host TLB trees.

--------------

WIP: Wasn't meant to be merged, it's going to be refined to be added later when more data/ testing have been made about this approach.
Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/318
Reviewed-by: Shinmegumi <shinmegumi@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/337
Co-authored-by: CamilleLaVey <camillelavey99@gmail.com>
Co-committed-by: CamilleLaVey <camillelavey99@gmail.com>

src/core/arm/dynarmic/arm_dynarmic_32.cpp

@@ -215,7 +215,7 @@ std::shared_ptr<Dynarmic::A32::Jit> ArmDynarmic32::MakeJit(Common::PageTable* pa
 #ifdef ARCHITECTURE_arm64
     config.code_cache_size = std::uint32_t(128_MiB);
 #else
-    config.code_cache_size = std::uint32_t(2_GiB);
+    config.code_cache_size = std::uint32_t(512_MiB);
 #endif
 
     // Allow memory fault handling to work

src/core/arm/dynarmic/arm_dynarmic_64.cpp

@@ -273,7 +273,7 @@ std::shared_ptr<Dynarmic::A64::Jit> ArmDynarmic64::MakeJit(Common::PageTable* pa
 #ifdef ARCHITECTURE_arm64
     config.code_cache_size = std::uint32_t(128_MiB);
 #else
-    config.code_cache_size = std::uint32_t(2_GiB);
+    config.code_cache_size = std::uint32_t(512_MiB);
 #endif
 
     // Allow memory fault handling to work