Convert getFileOffset to getOffset and move it to its only user.

We normally don't drop functions from the C API's, but in this case I think we
can:

* The old implementation of getFileOffset was fairly broken
* The introduction of LLVMGetSymbolFileOffset was itself a C api breaking
  change as it removed LLVMGetSymbolOffset.
* It is an incredibly specialized use case. The only reason MCJIT needs it is
  because of its odd position of being a dynamic linker of .o files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206750 91177308-0d34-0410-b5e6-96231b3b80d8

bindings/python/llvm/object.py

@@ -310,14 +310,6 @@ class Symbol(LLVMObject):
 
         return lib.LLVMGetSymbolAddress(self)
 
-    @CachedProperty
-    def file_offset(self):
-        """The offset of this symbol in the file, in long bytes."""
-        if self.expired:
-            raise Exception('Symbol instance has expired.')
-
-        return lib.LLVMGetSymbolFileOffset(self)
-
     @CachedProperty
     def size(self):
         """The size of the symbol, in long bytes."""
@@ -345,7 +337,6 @@ class Symbol(LLVMObject):
         """Cache all cacheable properties."""
         getattr(self, 'name')
         getattr(self, 'address')
-        getattr(self, 'file_offset')
         getattr(self, 'size')
 
     def expire(self):
@@ -495,9 +486,6 @@ def register_library(library):
     library.LLVMGetSymbolAddress.argtypes = [Symbol]
     library.LLVMGetSymbolAddress.restype = c_uint64
 
-    library.LLVMGetSymbolFileOffset.argtypes = [Symbol]
-    library.LLVMGetSymbolFileOffset.restype = c_uint64
-
     library.LLVMGetSymbolSize.argtypes = [Symbol]
     library.LLVMGetSymbolSize.restype = c_uint64