Remove the leading '/' in jit zygote memfd/ashmem names.

This avoids having two '/' in case the jit zygote code cache
is using ashmem.

Test: cat /proc/pid/smaps
Change-Id: Ibff035949c3ff12ab513be75078255b804eef7a5
diff --git a/runtime/jit/jit_memory_region.cc b/runtime/jit/jit_memory_region.cc
index 12e5d54..43ef08e 100644
--- a/runtime/jit/jit_memory_region.cc
+++ b/runtime/jit/jit_memory_region.cc
@@ -73,7 +73,7 @@
     }
   } else {
     // Bionic supports memfd_create, but the call may fail on older kernels.
-    mem_fd = unique_fd(art::memfd_create("/jit-cache", /* flags= */ 0));
+    mem_fd = unique_fd(art::memfd_create("jit-cache", /* flags= */ 0));
     if (mem_fd.get() < 0) {
       std::ostringstream oss;
       oss << "Failed to initialize dual view JIT. memfd_create() error: " << strerror(errno);
@@ -505,7 +505,7 @@
     return -1;
   }
   /* Check if kernel support exists, otherwise fall back to ashmem */
-  static const char* kRegionName = "/jit-zygote-cache";
+  static const char* kRegionName = "jit-zygote-cache";
   if (art::IsSealFutureWriteSupported()) {
     int fd = art::memfd_create(kRegionName, MFD_ALLOW_SEALING);
     if (fd == -1) {