Refactor rel32 searching process for x64 to make it more similar to x86.

courgette/testdata/rel32_win32_x86_03.txt

Index: courgette/testdata/rel32_win32_x86_03.txt
diff --git a/courgette/testdata/rel32_win32_x86_03.txt b/courgette/testdata/rel32_win32_x86_03.txt
deleted file mode 100644
index 6403b103caa0e3728ef0b7e6c7619d80a67f8ebb..0000000000000000000000000000000000000000
--- a/courgette/testdata/rel32_win32_x86_03.txt
+++ /dev/null
@@ -1,40 +0,0 @@
-# Test target validity: only accept target RVA in [1000, 3000).
-
-# .text start RVA and end RVA
-1000
-3000
-# .reloc start RVA and end RVA
-3800
-4000
-# End RVA
-5000
-
-# Assume ImageBase = 00400000. This does not affect the test.
-Program:
-  00401000: 55                 push        ebp
-  00401001: 8B EC              mov         ebp,esp
-  00401003: E8 F8 EF FF FF     call        00400000  # RVA start, outside .text
-  00401008: E8 F3 FF FF FF     call        00401000
-  0040100D: E8 ED FF FF FF     call        00400FFF  # 1 byte before .text
-  00401012: 90                 nop                   # Padding so E8 & E9 ...
-  00401013: 90                 nop
-  00401014: E9 E7 FF FF FF     jmp         00401000  # ... don't appear here.
-  00401019: E9 E1 FF FF FF     jmp         00400FFF  # 1 byte before .text
-  0040101E: E8 DC 1F 00 00     call        00402FFF
-  00401023: E8 D8 1F 00 00     call        00403000  # 1 byte after .text
-  00401028: 0F 87 D1 1F 00 00  ja          00402FFF
-  0040102E: 0F 88 CC 1F 00 00  js          00403000  # 1 byte after .text
-  00401034: E8 C6 3F 00 00     call        00404FFF  # In image, outside .text
-  00401039: E8 C2 3F 00 00     call        00405000  # Outside image
-  0040103E: E8 BE 3F 00 00     call        00405001  # Outside image
-  00401043: E8 88 88 88 88     call        88C898D0  # Far away
-  00401048: 5D                 pop         ebp
-  00401049: C3                 ret
-
-Abs32:
-
-Expected:
-1009
-1015
-101F
-102A