[Fuzzer][Test-Only] Increase runs for reduce-inputs.test (llvm#165402)

This test fails on some arm64 macOS runs currently.

This patch bumps up the number of runs by 10x to hopefully get it
passing consistently.

rdar://162122184

Author: DanBlackwell

compiler-rt/test/fuzzer/reduce_inputs.test

@@ -12,5 +12,5 @@ RUN: %run %t-ShrinkControlFlowSimpleTest -runs=0 %t/C 2>&1 | FileCheck %s --chec
 COUNT: seed corpus: files: 4
 
 # a bit longer test
-RUN: %run %t-ShrinkControlFlowTest  -exit_on_item=0eb8e4ed029b774d80f2b66408203801cb982a60  -seed=42 -runs=1000000  2>&1 | FileCheck %s
+RUN: %run %t-ShrinkControlFlowTest  -exit_on_item=0eb8e4ed029b774d80f2b66408203801cb982a60  -seed=42 -runs=10000000  2>&1 | FileCheck %s