Add intel_gpu_dump from the 2D driver.

man/Makefile.am

@@ -1,6 +1,7 @@
 dist_man1_MANS = \
 	intel_gpu_dump.1 \
 	intel_gpu_top.1 \
+	intel_reg_dumper.1 \
 	intel_reg_write.1 \
 	intel_stepping.1 \
 	intel_upload_blit_large.1 \

man/intel_reg_dumper.1

@@ -0,0 +1,11 @@
+emacs .\" shorthand for double quote that works everywhere.
+.ds q \N'34'
+.TH intel_reg_dumper 1 "intel_reg_dumper 1.0"
+.SH NAME
+intel_reg_dumper \- Decode a bunch of Intel GPU registers for debugging
+.SH SYNOPSIS
+.B intel_reg_dumper
+.SH DESCRIPTION
+.B intel_reg_write
+is a tool to read and decode the values of many Intel GPU registers.  It is
+commonly used in debugging video mode setting issues.