Fastmem: increase the size of trampoline cache in MMU mode, check space

Fastmem in MMU mode generates way more trampolines than normal, so we need
a bunch more space too, lest we run out of room.

Source/Core/Core/PowerPC/Jit64/Jit.cpp

@@ -183,7 +183,7 @@ void Jit64::Init()
 	gpr.SetEmitter(this);
 	fpr.SetEmitter(this);
 
-	trampolines.Init();
+	trampolines.Init(js.memcheck ? TRAMPOLINE_CODE_SIZE_MMU : TRAMPOLINE_CODE_SIZE);
 	AllocCodeSpace(CODE_SIZE);
 
 	// BLR optimization has the same consequences as block linking, as well as
@@ -494,9 +494,10 @@ void Jit64::Jit(u32 em_address)
 {
 	if (GetSpaceLeft() < 0x10000 ||
 	    farcode.GetSpaceLeft() < 0x10000 ||
-		blocks.IsFull() ||
-		SConfig::GetInstance().m_LocalCoreStartupParameter.bJITNoBlockCache ||
-		m_clear_cache_asap)
+	    trampolines.GetSpaceLeft() < 0x10000 ||
+	    blocks.IsFull() ||
+	    SConfig::GetInstance().m_LocalCoreStartupParameter.bJITNoBlockCache ||
+	    m_clear_cache_asap)
 	{
 		ClearCache();
 	}

Source/Core/Core/PowerPC/Jit64IL/JitIL.cpp

@@ -249,7 +249,7 @@ void JitIL::Init()
 	jo.accurateSinglePrecision = false;
 	js.memcheck = SConfig::GetInstance().m_LocalCoreStartupParameter.bMMU;
 
-	trampolines.Init();
+	trampolines.Init(js.memcheck ? TRAMPOLINE_CODE_SIZE_MMU : TRAMPOLINE_CODE_SIZE);
 	AllocCodeSpace(CODE_SIZE);
 	blocks.Init();
 	asm_routines.Init(nullptr);

Source/Core/Core/PowerPC/JitCommon/Jit_Util.h

@@ -42,6 +42,10 @@ static const int CODE_SIZE = 1024 * 1024 * 32;
 static const int FARCODE_SIZE = 1024 * 1024 * 8;
 static const int FARCODE_SIZE_MMU = 1024 * 1024 * 48;
 
+// same for the trampoline code cache, because fastmem results in far more backpatches in MMU mode
+static const int TRAMPOLINE_CODE_SIZE = 1024 * 1024 * 8;
+static const int TRAMPOLINE_CODE_SIZE_MMU = 1024 * 1024 * 32;
+
 // Like XCodeBlock but has some utilities for memory access.
 class EmuCodeBlock : public Gen::X64CodeBlock
 {

Source/Core/Core/PowerPC/JitCommon/TrampolineCache.cpp

@@ -19,9 +19,9 @@
 
 using namespace Gen;
 
-void TrampolineCache::Init()
+void TrampolineCache::Init(int size)
 {
-	AllocCodeSpace(8 * 1024 * 1024);
+	AllocCodeSpace(size);
 }
 
 void TrampolineCache::ClearCodeSpace()

Source/Core/Core/PowerPC/JitCommon/TrampolineCache.h

@@ -17,7 +17,7 @@ const int BACKPATCH_SIZE = 5;
 class TrampolineCache : public Gen::X64CodeBlock
 {
 public:
-	void Init();
+	void Init(int size);
 	void Shutdown();
 
 	const u8* GenerateReadTrampoline(const InstructionInfo &info, BitSet32 registersInUse, u8* exceptionHandler, u8* returnPtr);