Revert "add integration tests, unwind across FFI boundary"

This reverts commit baf227e.

Author: pnkfelix

src/test/run-make-fulldeps/c-unwind-abi-catch-lib-panic/Makefile

@@ -7,7 +7,7 @@
 // compile-flags:-C panic=abort
 // aux-build:helper.rs
 
-#![feature(start, rustc_private, new_uninit, panic_info_message, lang_items)]
+#![feature(start, rustc_private, new_uninit, panic_info_message)]
 #![feature(alloc_error_handler)]
 #![no_std]
 
@@ -84,13 +84,6 @@ fn panic(panic_info: &core::panic::PanicInfo) -> ! {
     }
 }
 
-// Because we are compiling this code with `-C panic=abort`, this wouldn't normally be needed.
-// However, `core` and `alloc` are both compiled with `-C panic=unwind`, which means that functions
-// in these libaries will refer to `rust_eh_personality` if LLVM can not *prove* the contents won't
-// unwind. So, for this test case we will define the symbol.
-#[lang = "eh_personality"]
-extern fn rust_eh_personality() {}
-
 #[derive(Debug)]
 struct Page([[u64; 32]; 16]);
 

src/test/run-make-fulldeps/c-unwind-abi-catch-lib-panic/add.c

@@ -8,7 +8,7 @@
 // aux-build:helper.rs
 // gate-test-default_alloc_error_handler
 
-#![feature(start, rustc_private, new_uninit, panic_info_message, lang_items)]
+#![feature(start, rustc_private, new_uninit, panic_info_message)]
 #![feature(default_alloc_error_handler)]
 #![no_std]
 
@@ -71,13 +71,6 @@ fn panic(panic_info: &core::panic::PanicInfo) -> ! {
     }
 }
 
-// Because we are compiling this code with `-C panic=abort`, this wouldn't normally be needed.
-// However, `core` and `alloc` are both compiled with `-C panic=unwind`, which means that functions
-// in these libaries will refer to `rust_eh_personality` if LLVM can not *prove* the contents won't
-// unwind. So, for this test case we will define the symbol.
-#[lang = "eh_personality"]
-extern fn rust_eh_personality() {}
-
 #[derive(Debug)]
 struct Page([[u64; 32]; 16]);
 

src/test/run-make-fulldeps/c-unwind-abi-catch-lib-panic/main.rs

@@ -74,3 +74,7 @@ fn main() {
         }
     };
 }
+
+// FIXME(katie): The 32-bit symbol hash probably needs updating as well, but I'm slightly unsure
+// about how to do that. This comment is here so that we don't break the test due to error messages
+// including incorrect line numbers.