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

courgette/testdata/rel32_win32_x86_01.txt

Index: courgette/testdata/rel32_win32_x86_01.txt
diff --git a/courgette/testdata/rel32_win32_x86_01.txt b/courgette/testdata/rel32_win32_x86_01.txt
deleted file mode 100644
index 4234c86fcf07e466e9591f6fefb4886eea660a75..0000000000000000000000000000000000000000
--- a/courgette/testdata/rel32_win32_x86_01.txt
+++ /dev/null
@@ -1,55 +0,0 @@
-# Test all rel32 jump instructions.
-
-# .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 00 00 00 00     call        00401008
-  00401008: E9 00 00 00 00     jmp         0040100D
-  0040100D: 0F 80 00 00 00 00  jo          00401013
-  00401013: 0F 81 00 00 00 00  jno         00401019
-  00401019: 0F 82 00 00 00 00  jb          0040101F
-  0040101F: 0F 83 00 00 00 00  jae         00401025
-  00401025: 0F 84 00 00 00 00  je          0040102B
-  0040102B: 0F 85 00 00 00 00  jne         00401031
-  00401031: 0F 86 00 00 00 00  jbe         00401037
-  00401037: 0F 87 00 00 00 00  ja          0040103D
-  0040103D: 0F 88 00 00 00 00  js          00401043
-  00401043: 0F 89 00 00 00 00  jns         00401049
-  00401049: 0F 8A 00 00 00 00  jp          0040104F  # Ignored!
-  0040104F: 0F 8B 00 00 00 00  jnp         00401055  # Ignored!
-  00401055: 0F 8C 00 00 00 00  jl          0040105B
-  0040105B: 0F 8D 00 00 00 00  jge         00401061
-  00401061: 0F 8E 00 00 00 00  jle         00401067
-  00401067: 0F 8F 00 00 00 00  jg          0040106D
-  0040106D: 5D                 pop         ebp
-  0040106E: C3                 ret
-
-Abs32:
-
-Expected:
-1004
-1009
-100F
-1015
-101B
-1021
-1027
-102D
-1033
-1039
-103F
-1045
-1057
-105D
-1063
-1069