thermosphere: unfuck qemu JIT, fix exc. handling bug, add cache funcs

thermosphere/src/arm.h

@@ -0,0 +1,10 @@
+#pragma once
+
+void flush_dcache_all(void);
+void invalidate_dcache_all(void);
+
+void flush_dcache_range(const void *start, const void *end);
+void invalidate_dcache_range(const void *start, const void *end);
+
+void invalidate_icache_all_inner_shareable(void);
+void invalidate_icache_all(void);