Fix WriteAsOperand to not emit a leading space character. Adjust
its callers to emit a space character before calling it when a
space is needed.

This fixes several spurious whitespace issues in
ScalarEvolution's debug dumps. See the test changes for
examples.

This also fixes odd space-after-tab indentation in the output
for switch statements, and changes calls from being printed like
this:
  call void @foo( i32 %x )
to this:
  call void @foo(i32 %x)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56196 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/ScalarEvolution/2008-08-04-IVOverflow.ll b/test/Analysis/ScalarEvolution/2008-08-04-IVOverflow.ll
index 04cd289..f8e1cfc 100644
--- a/test/Analysis/ScalarEvolution/2008-08-04-IVOverflow.ll
+++ b/test/Analysis/ScalarEvolution/2008-08-04-IVOverflow.ll
@@ -1,5 +1,5 @@
 ; RUN: llvm-as < %s | opt -analyze -scalar-evolution -disable-output \
-; RUN:   -scalar-evolution-max-iterations=0 | grep -F "Exits:  20028"
+; RUN:   -scalar-evolution-max-iterations=0 | grep -F "Exits: 20028"
 ; PR2621
 
 define i32 @a() nounwind  {