Disable dead stripping

Without it, some optimized targets would fail to launch with the
following error:

ERROR: The size of coverage PC tables does not match the
number of instrumented PCs. This might be a compiler bug,
please contact the libFuzzer developers.
Also check https://bugs.llvm.org/show_bug.cgi?id=34636
for possible workarounds (tl;dr: don't use the old GNU ld)

Related to:
- google/oss-fuzz#1042
- llvm.org/pr34636

src/main.rs

@@ -345,6 +345,7 @@ impl FuzzProject {
              -Cllvm-args=-sanitizer-coverage-trace-geps \
              -Cllvm-args=-sanitizer-coverage-prune-blocks=0 \
              -Cllvm-args=-sanitizer-coverage-pc-table \
+             -Clink-dead-code \
              -Zsanitizer={sanitizer}",
             sanitizer = sanitizer,
         );