recompilers: always allocate the first block

Avoid several annoying SIGSEGV at startup

common/include/Utilities/PageFaultSource.h

@@ -248,6 +248,11 @@ public:
 		return m_blocksize * __pagesize;
 	}
 
+	virtual void Reset()
+	{
+		_parent::Reset();
+	}
+	
 protected:
 
 	// This function is called from OnPageFaultEvent after the address has been translated

pcsx2/System.cpp

@@ -73,9 +73,23 @@ void* RecompiledCodeReserve::Reserve( size_t size, uptr base, uptr upper_bounds
 {
 	if (!_parent::Reserve(size, base, upper_bounds)) return NULL;
 	_registerProfiler();
+
+	// Pre-Allocate the first block (to reduce the number of segmentation fault
+	// in debugger)
+	DoCommitAndProtect(0);
+
 	return m_baseptr;
 }
 
+void RecompiledCodeReserve::Reset()
+{
+	_parent::Reset();
+
+	// Pre-Allocate the first block (to reduce the number of segmentation fault
+	// in debugger)
+	DoCommitAndProtect(0);
+}
+
 
 // Sets the abbreviated name used by the profiler.  Name should be under 10 characters long.
 // After a name has been set, a profiler source will be automatically registered and cleared

pcsx2/System/RecTypes.h

@@ -42,6 +42,7 @@ public:
 
 	virtual void* Reserve( size_t size, uptr base=0, uptr upper_bounds=0 );
 	virtual void OnCommittedBlock( void* block );
+	virtual void Reset();
 
 	virtual RecompiledCodeReserve& SetProfilerName( const wxString& shortname );
 	virtual RecompiledCodeReserve& SetProfilerName( const char* shortname )