Clang-format c/cpp files in test directory (#4192)

This clang-formats c/cpp files in test/ directory, and updates
clang-format-diff.sh so that it does not ignore test/ directory anymore.

bigswitch.cpp is excluded from formatting, because there are big
commented-out code blocks, and apparently clang-format messes up
formatting in them. Also to make matters worse, different clang-format
versions do different things on those commented-out code blocks.

1 files changed, 3 insertions, 11 deletions

diff --git a/test/lld/init.c b/test/lld/init.c
index 3a9311e3c..d59f70e1e 100644
--- a/test/lld/init.c
+++ b/test/lld/init.c
@@ -1,15 +1,7 @@
 volatile int x, y;
 
-__attribute__((constructor))
-void init_x() {
-    x = 14;
-}
+__attribute__((constructor)) void init_x() { x = 14; }
 
-__attribute__((constructor))
-void init_y() {
-    y = 144;
-}
+__attribute__((constructor)) void init_y() { y = 144; }
 
-int main() {
-    return x + y;
-}
+int main() { return x + y; }