Avoid relocations in struct PDF_PSOpName.

Per Chromium's docs/native_relocations.md, sometimes it makes sense to
restructure read-only data to avoid relocations. In this case, the
results are as follows on Linux:

.rodata: +384
.data.rel.ro: -672
.rela.dyn: -1008

So even disregarding the relocation data, which varies on platform, the
amount of read-only data goes down as a result of this change.

Change-Id: I7238a3014a1a710a195db245c8c9500333c43071
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/74835
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

core/fpdfapi/page/cpdf_psengine.cpp

diff --git a/core/fpdfapi/page/cpdf_psengine.cpp b/core/fpdfapi/page/cpdf_psengine.cpp
index 90cc27b..98fb60e 100644
--- a/core/fpdfapi/page/cpdf_psengine.cpp
+++ b/core/fpdfapi/page/cpdf_psengine.cpp
@@ -19,7 +19,8 @@
 namespace {
 
 struct PDF_PSOpName {
-  const char* name;
+  // Inline string data reduces size for small strings.
+  const char name[9];
   PDF_PSOP op;
 };