Fix test name.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48733 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CFrontend/2008-03-24-BitFiel-And-Alloca.c b/test/CFrontend/2008-03-24-BitField-And-Alloca.c
similarity index 100%
rename from test/CFrontend/2008-03-24-BitFiel-And-Alloca.c
rename to test/CFrontend/2008-03-24-BitField-And-Alloca.c