[Tests] NFC: Disable diagnostics in test/SIL/lifetime_dependence_buffer_view_test.swift

With NCGenerics enabled the test-case started producing a diagnostic
in a spot marked with a TODO, Meghana suggested to temporary disable
the diagnostics.

Author: xedin

test/SIL/lifetime_dependence_buffer_view_test.swift

@@ -2,7 +2,8 @@
 // RUN:   -disable-experimental-parser-round-trip \
 // RUN:   -enable-experimental-feature NonescapableTypes \
 // RUN:   -enable-experimental-feature NoncopyableGenerics \
-// RUN:   -enable-experimental-lifetime-dependence-inference
+// RUN:   -enable-experimental-lifetime-dependence-inference \
+// RUN:   -disable-lifetime-dependence-diagnostics
 
 // REQUIRES: asserts
 // REQUIRES: swift_in_compiler