Fix missing "re" module import in GDB support script

tools/gdb-v8-support.py

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+import re
 
 kSmiTag = 0
 kSmiTagSize = 1
 kSmiTagMask = (1 << kSmiTagSize) - 1
 
 
 kHeapObjectTag = 1
 kHeapObjectTagSize = 2
 kHeapObjectTagMask = (1 << kHeapObjectTagSize) - 1
 
@@ skipping 138 matching lines @@
       if m is None:
         continue
       self.find(m.group(1), m.group(2), value)
     for l in gdb.execute("info proc mappings", to_string = True).split('\n'):
       m = FindAnywhere.LIVE_MAPPING_RE.match(l)
       if m is None:
         continue
       self.find(m.group(1), m.group(2), value)
 
 FindAnywhere()