[gcc r11-6485] Add <source_location> to the precompiled header.

[Edward Smith-Rowland]

https://gcc.gnu.org/g:ae1ada95fee1ee4fac0dec0486076d9787988a03

commit r11-6485-gae1ada95fee1ee4fac0dec0486076d9787988a03
Author: Ed Smith-Rowland <3dw4rd@verizon.net>
Date:   Tue Jan 5 15:50:06 2021 -0500

    Add <source_location> to the precompiled header.
    
    2021-01-05  Ed Smith-Rowland  <3dw4rd@verizon.net>
    
            * include/precompiled/stdc++.h: Add <source_location> to C++20 section.

Diff:
---
 libstdc++-v3/include/precompiled/stdc++.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/include/precompiled/stdc++.h b/libstdc++-v3/include/precompiled/stdc++.h
index 4973a38c64d..ef780e3981e 100644
--- a/libstdc++-v3/include/precompiled/stdc++.h
+++ b/libstdc++-v3/include/precompiled/stdc++.h
@@ -146,6 +146,7 @@
 #include <span>
 #include <stop_token>
 #include <semaphore>
+#include <source_location>
 #include <syncstream>
 #include <version>
 #endif