BumpPtrAllocator: remove 'no slabs allocated yet' check

We already handle the no-slabs case when checking whether the current slab
is large enough: if no slabs have been allocated, CurPtr and End are both 0.
alignPtr(0), will still be 0, and so "if (Ptr + Size <= End)" fails.

Differential Revision: http://reviews.llvm.org/D4943

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215841 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/Allocator.h

@@ -201,9 +201,6 @@ public:
 
   /// \brief Allocate space at the specified alignment.
   void *Allocate(size_t Size, size_t Alignment) {
-    if (!CurPtr) // Start a new slab if we haven't allocated one already.
-      StartNewSlab();
-
     // Keep track of how many bytes we've allocated.
     BytesAllocated += Size;
 

unittests/Support/AllocatorTest.cpp

@@ -112,7 +112,7 @@ TEST(AllocatorTest, TestSmallSlabSize) {
   BumpPtrAllocator Alloc;
 
   Alloc.Allocate(8000, 0);
-  EXPECT_EQ(2U, Alloc.GetNumSlabs());
+  EXPECT_EQ(1U, Alloc.GetNumSlabs());
 }
 
 // Mock slab allocator that returns slabs aligned on 4096 bytes.  There is no