Mark rust_eh_unwind_resume as #[inline(always)]

Author: Amanieu

src/libpanic_unwind/gcc.rs

@@ -332,6 +332,9 @@ unsafe fn find_eh_action(
 ))]
 #[lang = "eh_unwind_resume"]
 #[unwind(allowed)]
+// This must always be inlined because _Unwind_Resume expects to be called
+// directly from the landing pad.
+#[cfg_attr(not(bootstrap), inline(always))]
 unsafe extern "C" fn rust_eh_unwind_resume(panic_ctx: *mut u8) -> ! {
     uw::_Unwind_Resume(panic_ctx as *mut uw::_Unwind_Exception);
 }