PPC context header adjustments. (#123)

Restoring env to ctx was causing this because the return value was getting assigned to r3 before the if check.

XenonRecomp/recompiler.cpp

@@ -378,8 +378,9 @@ bool Recompiler::Recompile(
             else if (address == config.setJmpAddress)
             {
                 println("\t{} = ctx;", env());
-                println("\t{}.s64 = setjmp(*reinterpret_cast<jmp_buf*>(base + {}.u32));", r(3), r(3));
-                println("\tif ({}.s64 != 0) ctx = {};", r(3), env());
+                println("\t{}.s64 = setjmp(*reinterpret_cast<jmp_buf*>(base + {}.u32));", temp(), r(3));
+                println("\tif ({}.s64 != 0) ctx = {};", temp(), env());
+                println("\t{} = {};", r(3), temp());
             }
             else
             {

XenonUtils/ppc_context.h

@@ -123,21 +123,18 @@ struct PPCFuncMapping
 
 extern PPCFuncMapping PPCFuncMappings[];
 
-struct PPCRegister
+union PPCRegister
 {
-    union
-    {
-        int8_t s8;
-        uint8_t u8;
-        int16_t s16;
-        uint16_t u16;
-        int32_t s32;
-        uint32_t u32;
-        int64_t s64;
-        uint64_t u64;
-        float f32;
-        double f64;
-    };
+    int8_t s8;
+    uint8_t u8;
+    int16_t s16;
+    uint16_t u16;
+    int32_t s32;
+    uint32_t u32;
+    int64_t s64;
+    uint64_t u64;
+    float f32;
+    double f64;
 };
 
 struct PPCXERRegister
@@ -194,21 +191,18 @@ struct PPCCRRegister
     }
 };
 
-struct alignas(0x10) PPCVRegister
+union alignas(0x10) PPCVRegister
 {
-    union
-    {
-        int8_t s8[16];
-        uint8_t u8[16];
-        int16_t s16[8];
-        uint16_t u16[8];
-        int32_t s32[4];
-        uint32_t u32[4];
-        int64_t s64[2];
-        uint64_t u64[2];
-        float f32[4];
-        double f64[2];
-    };
+    int8_t s8[16];
+    uint8_t u8[16];
+    int16_t s16[8];
+    uint16_t u16[8];
+    int32_t s32[4];
+    uint32_t u32[4];
+    int64_t s64[2];
+    uint64_t u64[2];
+    float f32[4];
+    double f64[2];
 };
 
 #define PPC_ROUND_NEAREST 0x00
@@ -270,7 +264,7 @@ struct PPCFPSCRRegister
     }
 };
 
-struct PPCContext
+struct alignas(0x40) PPCContext
 {
     PPCRegister r3;
 #ifndef PPC_CONFIG_NON_ARGUMENT_AS_LOCAL