Restore some MSVC warnings.

bcm.c means e_aes.c can no longer be lazy about warning push/pop.

Change-Id: I558041bab3baa00e3adc628fe19486545d0f6be3
Reviewed-on: https://boringssl-review.googlesource.com/28164
Commit-Queue: Steven Valdez <svaldez@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/crypto/fipsmodule/cipher/e_aes.c b/crypto/fipsmodule/cipher/e_aes.c
index 8377f0c..3617e48 100644
--- a/crypto/fipsmodule/cipher/e_aes.c
+++ b/crypto/fipsmodule/cipher/e_aes.c
@@ -68,6 +68,7 @@
 #endif
 
 
+OPENSSL_MSVC_PRAGMA(warning(push))
 OPENSSL_MSVC_PRAGMA(warning(disable: 4702))  // Unreachable code.
 
 typedef struct {
@@ -1435,3 +1436,5 @@
   return 0;
 #endif
 }
+
+OPENSSL_MSVC_PRAGMA(warning(pop))