travis: Build presubmit arm32 build with lld

Demote ld.bfd to cron only just to make sure it still works.

Signed-off-by: Nathan Chancellor <[email protected]>

Author: nathanchance

.travis.yml

@@ -2,15 +2,18 @@ language: cpp
 matrix:
   include:
     # linux
-    - name: "ARCH=arm"
-      env: ARCH=arm
+    - name: "ARCH=arm LD=ld.lld"
+      env: ARCH=arm LD=ld.lld-8
     - name: "ARCH=arm64 LD=ld.lld"
       env: ARCH=arm64 LD=ld.lld-8
     - name: "ARCH=ppc64le"
       env: ARCH=ppc64le
     - name: "ARCH=x86_64"
       env: ARCH=x86_64
     # linux (cron only)
+    - name: "ARCH=arm"
+      env: ARCH=arm
+      if: type = cron
     - name: "ARCH=arm64"
       env: ARCH=arm64
       if: type = cron